1642621396 has 24 divisors (see below), whose sum is σ = 3277811880. Its totient is φ = 713536512.

The previous prime is 1642621381. The next prime is 1642621403. The reversal of 1642621396 is 6931262461.

It can be written as a sum of positive squares in 4 ways, for example, as 719312400 + 923308996 = 26820^2 + 30386^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 928201 + ... + 929968.

It is an arithmetic number, because the mean of its divisors is an integer number (136575495).

Almost surely, 2^1642621396 is an apocalyptic number.

It is an amenable number.

1642621396 is a deficient number, since it is larger than the sum of its proper divisors (1635190484).

1642621396 is a wasteful number, since it uses less digits than its factorization.

1642621396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1858203 (or 1858201 counting only the distinct ones).

The product of its digits is 93312, while the sum is 40.

The square root of 1642621396 is about 40529.2659198264. The cubic root of 1642621396 is about 1179.9016953440.

The spelling of 1642621396 in words is "one billion, six hundred forty-two million, six hundred twenty-one thousand, three hundred ninety-six".