1642120854 has 32 divisors (see below), whose sum is σ = 3641552640. Its totient is φ = 489453600.

The previous prime is 1642120849. The next prime is 1642120901. The reversal of 1642120854 is 4580212461.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199914 + ... + 207965.

It is an arithmetic number, because the mean of its divisors is an integer number (113798520).

Almost surely, 2^1642120854 is an apocalyptic number.

1642120854 is an abundant number, since it is smaller than the sum of its proper divisors (1999431786).

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

1642120854 is a wasteful number, since it uses less digits than its factorization.

1642120854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407956.

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 1642120854 is about 40523.0903806706. The cubic root of 1642120854 is about 1179.7818360438.

The spelling of 1642120854 in words is "one billion, six hundred forty-two million, one hundred twenty thousand, eight hundred fifty-four".