1231402403 has 32 divisors (see below), whose sum is σ = 1560453120. Its totient is φ = 943920000.

The previous prime is 1231402399. The next prime is 1231402411. The reversal of 1231402403 is 3042041321.

It is a cyclic number.

It is not a de Polignac number, because 1231402403 - 2² = 1231402399 is a prime.

It is a super-2 number, since 2×1231402403² = 3032703756228348818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231402453) 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, 1484993 + ... + 1485821.

It is an arithmetic number, because the mean of its divisors is an integer number (48764160).

Almost surely, 2^1231402403 is an apocalyptic number.

1231402403 is a deficient number, since it is larger than the sum of its proper divisors (329050717).

1231402403 is a wasteful number, since it uses less digits than its factorization.

1231402403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1231402403 is about 35091.3437046802. The cubic root of 1231402403 is about 1071.8483216541.

Adding to 1231402403 its reverse (3042041321), we get a palindrome (4273443724).

The spelling of 1231402403 in words is "one billion, two hundred thirty-one million, four hundred two thousand, four hundred three".