1497979978 has 16 divisors (see below), whose sum is σ = 2535766560. Its totient is φ = 657420400.

The previous prime is 1497979927. The next prime is 1497979997. The reversal of 1497979978 is 8799797941.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1173328 + ... + 1174603.

It is an arithmetic number, because the mean of its divisors is an integer number (158485410).

Almost surely, 2^1497979978 is an apocalyptic number.

1497979978 is a deficient number, since it is larger than the sum of its proper divisors (1037786582).

1497979978 is a wasteful number, since it uses less digits than its factorization.

1497979978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2347973.

The product of its digits is 72013536, while the sum is 70.

The square root of 1497979978 is about 38703.7463044600. The cubic root of 1497979978 is about 1144.2001566134.

The spelling of 1497979978 in words is "one billion, four hundred ninety-seven million, nine hundred seventy-nine thousand, nine hundred seventy-eight".