1957858021 has 16 divisors (see below), whose sum is σ = 2361794560. Its totient is φ = 1585468080.

The previous prime is 1957858009. The next prime is 1957858061. The reversal of 1957858021 is 1208587591.

It is not a de Polignac number, because 1957858021 - 2¹⁹ = 1957333733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1957858061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28756 + ... + 68866.

It is an arithmetic number, because the mean of its divisors is an integer number (147612160).

Almost surely, 2^1957858021 is an apocalyptic number.

It is an amenable number.

1957858021 is a deficient number, since it is larger than the sum of its proper divisors (403936539).

1957858021 is a wasteful number, since it uses less digits than its factorization.

1957858021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40504.

The product of its (nonzero) digits is 201600, while the sum is 46.

The square root of 1957858021 is about 44247.6894425008. The cubic root of 1957858021 is about 1251.0088966297.

The spelling of 1957858021 in words is "one billion, nine hundred fifty-seven million, eight hundred fifty-eight thousand, twenty-one".