1260939990 has 16 divisors (see below), whose sum is σ = 3026256048. Its totient is φ = 336250656.

The previous prime is 1260939989. The next prime is 1260939991. The reversal of 1260939990 is 999390621.

It is an interprime number because it is at equal distance from previous prime (1260939989) and next prime (1260939991).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1260939991) 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, 21015637 + ... + 21015696.

It is an arithmetic number, because the mean of its divisors is an integer number (189141003).

Almost surely, 2^1260939990 is an apocalyptic number.

1260939990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1260939990 is an abundant number, since it is smaller than the sum of its proper divisors (1765316058).

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

1260939990 is a wasteful number, since it uses less digits than its factorization.

1260939990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42031343.

The product of its (nonzero) digits is 236196, while the sum is 48.

The square root of 1260939990 is about 35509.7168391977. The cubic root of 1260939990 is about 1080.3508205286.

The spelling of 1260939990 in words is "one billion, two hundred sixty million, nine hundred thirty-nine thousand, nine hundred ninety".