1231402090 has 16 divisors (see below), whose sum is σ = 2225802240. Its totient is φ = 490498960.

The previous prime is 1231402087. The next prime is 1231402091. The reversal of 1231402090 is 902041321.

It is a super-2 number, since 2×1231402090² = 3032702214512736200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1231402091) 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, 255226 + ... + 260005.

It is an arithmetic number, because the mean of its divisors is an integer number (139112640).

Almost surely, 2^1231402090 is an apocalyptic number.

1231402090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1231402090 is a deficient number, since it is larger than the sum of its proper divisors (994400150).

1231402090 is a wasteful number, since it uses less digits than its factorization.

1231402090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515477.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1231402090 is about 35091.3392448906. The cubic root of 1231402090 is about 1071.8482308393.

The spelling of 1231402090 in words is "one billion, two hundred thirty-one million, four hundred two thousand, ninety".