1256449970 has 32 divisors (see below), whose sum is σ = 2295371520. Its totient is φ = 495106560.

The previous prime is 1256449963. The next prime is 1256449973. The reversal of 1256449970 is 799446521.

It is a super-2 number, since 2×1256449970² = 3157333054226001800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1256449973) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 411650 + ... + 414690.

It is an arithmetic number, because the mean of its divisors is an integer number (71730360).

Almost surely, 2^1256449970 is an apocalyptic number.

1256449970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1256449970 is a deficient number, since it is larger than the sum of its proper divisors (1038921550).

1256449970 is a wasteful number, since it uses less digits than its factorization.

1256449970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3650.

The product of its (nonzero) digits is 544320, while the sum is 47.

The square root of 1256449970 is about 35446.4380438994. The cubic root of 1256449970 is about 1079.0669725257.

The spelling of 1256449970 in words is "one billion, two hundred fifty-six million, four hundred forty-nine thousand, nine hundred seventy".