1262979440 has 40 divisors (see below), whose sum is σ = 2959572480. Its totient is φ = 501209856.

The previous prime is 1262979439. The next prime is 1262979449. The reversal of 1262979440 is 449792621.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 1262979391 and 1262979400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1262979449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51995 + ... + 72314.

It is an arithmetic number, because the mean of its divisors is an integer number (73989312).

Almost surely, 2^1262979440 is an apocalyptic number.

1262979440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1262979440 is an abundant number, since it is smaller than the sum of its proper divisors (1696593040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1262979440 is a wasteful number, since it uses less digits than its factorization.

1262979440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124449 (or 124443 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 1262979440 is about 35538.4220246201. The cubic root of 1262979440 is about 1080.9329615444.

The spelling of 1262979440 in words is "one billion, two hundred sixty-two million, nine hundred seventy-nine thousand, four hundred forty".