1555420740 has 24 divisors (see below), whose sum is σ = 4355178240. Its totient is φ = 414778848.

The previous prime is 1555420721. The next prime is 1555420751. The reversal of 1555420740 is 470245551.

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, 12961780 + ... + 12961899.

It is an arithmetic number, because the mean of its divisors is an integer number (181465760).

Almost surely, 2^1555420740 is an apocalyptic number.

1555420740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1555420740 is an abundant number, since it is smaller than the sum of its proper divisors (2799757500).

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

1555420740 is a wasteful number, since it uses less digits than its factorization.

1555420740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25923691 (or 25923689 counting only the distinct ones).

The product of its (nonzero) digits is 28000, while the sum is 33.

The square root of 1555420740 is about 39438.8227511928. The cubic root of 1555420740 is about 1158.6420742953.

The spelling of 1555420740 in words is "one billion, five hundred fifty-five million, four hundred twenty thousand, seven hundred forty".