1620440455 has 16 divisors (see below), whose sum is σ = 1986163200. Its totient is φ = 1268860320.

The previous prime is 1620440449. The next prime is 1620440461. The reversal of 1620440455 is 5540440261.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1620440449) and next prime (1620440461).

It is not a de Polignac number, because 1620440455 - 2⁹ = 1620439943 is a prime.

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, 32926 + ... + 65764.

It is an arithmetic number, because the mean of its divisors is an integer number (124135200).

Almost surely, 2^1620440455 is an apocalyptic number.

1620440455 is a deficient number, since it is larger than the sum of its proper divisors (365722745).

1620440455 is a wasteful number, since it uses less digits than its factorization.

1620440455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33054.

The product of its (nonzero) digits is 19200, while the sum is 31.

The square root of 1620440455 is about 40254.6948193624. The cubic root of 1620440455 is about 1174.5667223987.

The spelling of 1620440455 in words is "one billion, six hundred twenty million, four hundred forty thousand, four hundred fifty-five".