1621913442 has 16 divisors (see below), whose sum is σ = 3255888960. Its totient is φ = 538627472.

The previous prime is 1621913437. The next prime is 1621913443. The reversal of 1621913442 is 2443191261.

It is not an unprimeable number, because it can be changed into a prime (1621913443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 500838 + ... + 504065.

It is an arithmetic number, because the mean of its divisors is an integer number (203493060).

Almost surely, 2^1621913442 is an apocalyptic number.

1621913442 is an abundant number, since it is smaller than the sum of its proper divisors (1633975518).

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

1621913442 is a wasteful number, since it uses less digits than its factorization.

1621913442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005177.

The product of its digits is 10368, while the sum is 33.

The square root of 1621913442 is about 40272.9865046038. The cubic root of 1621913442 is about 1174.9225099342.

The spelling of 1621913442 in words is "one billion, six hundred twenty-one million, nine hundred thirteen thousand, four hundred forty-two".