1267720372 has 6 divisors (see below), whose sum is σ = 2218510658. Its totient is φ = 633860184.

The previous prime is 1267720343. The next prime is 1267720397. The reversal of 1267720372 is 2730277621.

It can be written as a sum of positive squares in only one way, i.e., 1222481296 + 45239076 = 34964^2 + 6726^2 .

It is a super-2 number, since 2×1267720372² = 3214229883167636768, 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, 158465043 + ... + 158465050.

Almost surely, 2^1267720372 is an apocalyptic number.

It is an amenable number.

1267720372 is a deficient number, since it is larger than the sum of its proper divisors (950790286).

1267720372 is a wasteful number, since it uses less digits than its factorization.

1267720372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316930097 (or 316930095 counting only the distinct ones).

The product of its (nonzero) digits is 49392, while the sum is 37.

The square root of 1267720372 is about 35605.0610447447. The cubic root of 1267720372 is about 1082.2837966200.

Adding to 1267720372 its reverse (2730277621), we get a palindrome (3997997993).

The spelling of 1267720372 in words is "one billion, two hundred sixty-seven million, seven hundred twenty thousand, three hundred seventy-two".