1397142090 has 48 divisors (see below), whose sum is σ = 3668559336. Its totient is φ = 368880000.

The previous prime is 1397142073. The next prime is 1397142091. The reversal of 1397142090 is 902417931.

It can be written as a sum of positive squares in 4 ways, for example, as 1395694881 + 1447209 = 37359^2 + 1203^2 .

It is not an unprimeable number, because it can be changed into a prime (1397142091) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67761 + ... + 85940.

Almost surely, 2^1397142090 is an apocalyptic number.

1397142090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1397142090 is an abundant number, since it is smaller than the sum of its proper divisors (2271417246).

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

1397142090 is a wasteful number, since it uses less digits than its factorization.

1397142090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153815 (or 153812 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 1397142090 is about 37378.3639288827. The cubic root of 1397142090 is about 1117.9272063016.

The spelling of 1397142090 in words is "one billion, three hundred ninety-seven million, one hundred forty-two thousand, ninety".