1556402 has 4 divisors (see below), whose sum is σ = 2334606. Its totient is φ = 778200.

The previous prime is 1556393. The next prime is 1556413. The reversal of 1556402 is 2046551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2046551 = 13 ⋅157427.

It can be written as a sum of positive squares in only one way, i.e., 1297321 + 259081 = 1139^2 + 509^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389099 + ... + 389102.

2^1556402 is an apocalyptic number.

1556402 is a deficient number, since it is larger than the sum of its proper divisors (778204).

1556402 is an equidigital number, since it uses as much as digits as its factorization.

1556402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778203.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1556402 is about 1247.5584154660. The cubic root of 1556402 is about 115.8885671862. Note that the first 3 decimals are identical.

The spelling of 1556402 in words is "one million, five hundred fifty-six thousand, four hundred two".