2157356380 has 12 divisors (see below), whose sum is σ = 4530448440. Its totient is φ = 862942544.

The previous prime is 2157356329. The next prime is 2157356381. The reversal of 2157356380 is 836537512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157356381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53933890 + ... + 53933929.

It is an arithmetic number, because the mean of its divisors is an integer number (377537370).

Almost surely, 2^2157356380 is an apocalyptic number.

2157356380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2157356380 is an abundant number, since it is smaller than the sum of its proper divisors (2373092060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2157356380 is a wasteful number, since it uses less digits than its factorization.

2157356380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107867828 (or 107867826 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 40.

The square root of 2157356380 is about 46447.3506241206. The cubic root of 2157356380 is about 1292.1332370016.

The spelling of 2157356380 in words is "two billion, one hundred fifty-seven million, three hundred fifty-six thousand, three hundred eighty".