1490293978 has 16 divisors (see below), whose sum is σ = 2269006056. Its totient is φ = 733985280.

The previous prime is 1490293949. The next prime is 1490293991. The reversal of 1490293978 is 8793920941.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 894787569 + 595506409 = 29913^2 + 24403^2 .

It is a super-2 number, since 2×1490293978² = 4441952281726128968, which contains 22 as substring.

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, 113650 + ... + 126082.

Almost surely, 2^1490293978 is an apocalyptic number.

1490293978 is a deficient number, since it is larger than the sum of its proper divisors (778712078).

1490293978 is a wasteful number, since it uses less digits than its factorization.

1490293978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13329.

The product of its (nonzero) digits is 979776, while the sum is 52.

The square root of 1490293978 is about 38604.3258974950. The cubic root of 1490293978 is about 1142.2398708703.

The spelling of 1490293978 in words is "one billion, four hundred ninety million, two hundred ninety-three thousand, nine hundred seventy-eight".