1421665400 has 48 divisors (see below), whose sum is σ = 3375721440. Its totient is φ = 556563200.

The previous prime is 1421665373. The next prime is 1421665423. The reversal of 1421665400 is 45661241.

It is a super-2 number, since 2×1421665400² = 4042265019114320000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66221 + ... + 85020.

It is an arithmetic number, because the mean of its divisors is an integer number (70327530).

Almost surely, 2^1421665400 is an apocalyptic number.

1421665400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1421665400 is an abundant number, since it is smaller than the sum of its proper divisors (1954056040).

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

1421665400 is a wasteful number, since it uses less digits than its factorization.

1421665400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151304 (or 151295 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 1421665400 is about 37704.9784511276. The cubic root of 1421665400 is about 1124.4301047705.

The spelling of 1421665400 in words is "one billion, four hundred twenty-one million, six hundred sixty-five thousand, four hundred".