1261400456 has 32 divisors (see below), whose sum is σ = 2416285080. Its totient is φ = 617164800.

The previous prime is 1261400419. The next prime is 1261400473. The reversal of 1261400456 is 6540041621.

It can be written as a sum of positive squares in 4 ways, for example, as 890067556 + 371332900 = 29834^2 + 19270^2 .

It is a super-2 number, since 2×1261400456² = 3182262220794015872, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89576 + ... + 102696.

Almost surely, 2^1261400456 is an apocalyptic number.

It is an amenable number.

1261400456 is a deficient number, since it is larger than the sum of its proper divisors (1154884624).

1261400456 is a wasteful number, since it uses less digits than its factorization.

1261400456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13385 (or 13381 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 1261400456 is about 35516.1999093371. The cubic root of 1261400456 is about 1080.4823108673.

The spelling of 1261400456 in words is "one billion, two hundred sixty-one million, four hundred thousand, four hundred fifty-six".