1390561420 has 24 divisors (see below), whose sum is σ = 3014379648. Its totient is φ = 538281600.

The previous prime is 1390561387. The next prime is 1390561457. The reversal of 1390561420 is 241650931.

It is a super-2 number, since 2×1390561420² = 3867322125584832800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

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, 1120801 + ... + 1122040.

It is an arithmetic number, because the mean of its divisors is an integer number (125599152).

Almost surely, 2^1390561420 is an apocalyptic number.

1390561420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1390561420 is an abundant number, since it is smaller than the sum of its proper divisors (1623818228).

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

1390561420 is a wasteful number, since it uses less digits than its factorization.

1390561420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2242881 (or 2242879 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1390561420 is about 37290.2322331197. The cubic root of 1390561420 is about 1116.1692627908.

The spelling of 1390561420 in words is "one billion, three hundred ninety million, five hundred sixty-one thousand, four hundred twenty".