1538422990 has 32 divisors (see below), whose sum is σ = 3157600320. Its totient is φ = 534618624.

The previous prime is 1538422987. The next prime is 1538423017. The reversal of 1538422990 is 992248351.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 345850 + ... + 350269.

It is an arithmetic number, because the mean of its divisors is an integer number (98675010).

Almost surely, 2^1538422990 is an apocalyptic number.

1538422990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1538422990 is an abundant number, since it is smaller than the sum of its proper divisors (1619177330).

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

1538422990 is a wasteful number, since it uses less digits than its factorization.

1538422990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696156.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 1538422990 is about 39222.7356261646. The cubic root of 1538422990 is about 1154.4060313117.

The spelling of 1538422990 in words is "one billion, five hundred thirty-eight million, four hundred twenty-two thousand, nine hundred ninety".