1023657987 has 32 divisors (see below), whose sum is σ = 1556545536. Its totient is φ = 592336800.

The previous prime is 1023657977. The next prime is 1023657997. The reversal of 1023657987 is 7897563201.

It is an interprime number because it is at equal distance from previous prime (1023657977) and next prime (1023657997).

It is not a de Polignac number, because 1023657987 - 2⁶ = 1023657923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1023657917) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 614718 + ... + 616380.

It is an arithmetic number, because the mean of its divisors is an integer number (48642048).

Almost surely, 2^1023657987 is an apocalyptic number.

1023657987 is a deficient number, since it is larger than the sum of its proper divisors (532887549).

1023657987 is a wasteful number, since it uses less digits than its factorization.

1023657987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2511.

The product of its (nonzero) digits is 635040, while the sum is 48.

The square root of 1023657987 is about 31994.6556005843. The cubic root of 1023657987 is about 1007.8246114364.

The spelling of 1023657987 in words is "one billion, twenty-three million, six hundred fifty-seven thousand, nine hundred eighty-seven".