1564021402 has 4 divisors (see below), whose sum is σ = 2346032106. Its totient is φ = 782010700.

The previous prime is 1564021399. The next prime is 1564021421. The reversal of 1564021402 is 2041204651.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 832264801 + 731756601 = 28849^2 + 27051^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 391005349 + ... + 391005352.

Almost surely, 2^1564021402 is an apocalyptic number.

1564021402 is a deficient number, since it is larger than the sum of its proper divisors (782010704).

1564021402 is an equidigital number, since it uses as much as digits as its factorization.

1564021402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782010703.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 1564021402 is about 39547.7104520603. The cubic root of 1564021402 is about 1160.7737114315.

The spelling of 1564021402 in words is "one billion, five hundred sixty-four million, twenty-one thousand, four hundred two".