1257423670 has 32 divisors (see below), whose sum is σ = 2330850816. Its totient is φ = 488102400.

The previous prime is 1257423641. The next prime is 1257423679. The reversal of 1257423670 is 763247521.

It is a happy number.

It is a super-2 number, since 2×1257423670² = 3162228571752537800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257423679) 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, 70282 + ... + 86338.

It is an arithmetic number, because the mean of its divisors is an integer number (72839088).

Almost surely, 2^1257423670 is an apocalyptic number.

1257423670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1257423670 is a deficient number, since it is larger than the sum of its proper divisors (1073427146).

1257423670 is a wasteful number, since it uses less digits than its factorization.

1257423670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16296.

The product of its (nonzero) digits is 70560, while the sum is 37.

The square root of 1257423670 is about 35460.1701913570. The cubic root of 1257423670 is about 1079.3456455698.

The spelling of 1257423670 in words is "one billion, two hundred fifty-seven million, four hundred twenty-three thousand, six hundred seventy".