1287902920 has 32 divisors (see below), whose sum is σ = 2919913920. Its totient is φ = 511226560.

The previous prime is 1287902911. The next prime is 1287902927. The reversal of 1287902920 is 292097821.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (1287902927) 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, 117652 + ... + 128131.

It is an arithmetic number, because the mean of its divisors is an integer number (91247310).

Almost surely, 2^1287902920 is an apocalyptic number.

1287902920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1287902920 is an abundant number, since it is smaller than the sum of its proper divisors (1632011000).

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

1287902920 is a wasteful number, since it uses less digits than its factorization.

1287902920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245925 (or 245921 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 1287902920 is about 35887.3643501442. The cubic root of 1287902920 is about 1087.9970286287.

The spelling of 1287902920 in words is "one billion, two hundred eighty-seven million, nine hundred two thousand, nine hundred twenty".