1267921972 has 6 divisors (see below), whose sum is σ = 2218863458. Its totient is φ = 633960984.

The previous prime is 1267921969. The next prime is 1267921987. The reversal of 1267921972 is 2791297621.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1134611856 + 133310116 = 33684^2 + 11546^2 .

It is a super-2 number, since 2×1267921972² = 3215252254160737568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158490243 + ... + 158490250.

Almost surely, 2^1267921972 is an apocalyptic number.

It is an amenable number.

1267921972 is a deficient number, since it is larger than the sum of its proper divisors (950941486).

1267921972 is a wasteful number, since it uses less digits than its factorization.

1267921972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316980497 (or 316980495 counting only the distinct ones).

The product of its digits is 190512, while the sum is 46.

The square root of 1267921972 is about 35607.8919904001. The cubic root of 1267921972 is about 1082.3411638580.

The spelling of 1267921972 in words is "one billion, two hundred sixty-seven million, nine hundred twenty-one thousand, nine hundred seventy-two".