1870431987 has 12 divisors (see below), whose sum is σ = 2649240536. Its totient is φ = 1173603840.

The previous prime is 1870431977. The next prime is 1870432007. The reversal of 1870431987 is 7891340781.

It is not a de Polignac number, because 1870431987 - 2⁶ = 1870431923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1870431947) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1077814 + ... + 1079547.

Almost surely, 2^1870431987 is an apocalyptic number.

1870431987 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1870431987 is a deficient number, since it is larger than the sum of its proper divisors (778808549).

1870431987 is a wasteful number, since it uses less digits than its factorization.

1870431987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2157398 (or 2157381 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 48.

The square root of 1870431987 is about 43248.4911528714. The cubic root of 1870431987 is about 1232.1038282776.

The spelling of 1870431987 in words is "one billion, eight hundred seventy million, four hundred thirty-one thousand, nine hundred eighty-seven".