1906721002 has 8 divisors (see below), whose sum is σ = 2863861956. Its totient is φ = 952100352.

The previous prime is 1906720993. The next prime is 1906721009. The reversal of 1906721002 is 2001276091.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1758879721 + 147841281 = 41939^2 + 12159^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1906721009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 628183 + ... + 631210.

Almost surely, 2^1906721002 is an apocalyptic number.

1906721002 is a deficient number, since it is larger than the sum of its proper divisors (957140954).

1906721002 is a wasteful number, since it uses less digits than its factorization.

1906721002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1260152.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 1906721002 is about 43666.0165575016. The cubic root of 1906721002 is about 1240.0210285196.

Adding to 1906721002 its reverse (2001276091), we get a palindrome (3907997093).

The spelling of 1906721002 in words is "one billion, nine hundred six million, seven hundred twenty-one thousand, two".