1421553400 has 48 divisors (see below), whose sum is σ = 3479074200. Its totient is φ = 538692480.

The previous prime is 1421553361. The next prime is 1421553437. The reversal of 1421553400 is 43551241.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

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, 183247 + ... + 190846.

Almost surely, 2^1421553400 is an apocalyptic number.

1421553400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1421553400 is an abundant number, since it is smaller than the sum of its proper divisors (2057520800).

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

1421553400 is a wasteful number, since it uses less digits than its factorization.

1421553400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374128 (or 374119 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1421553400 is about 37703.4932068635. The cubic root of 1421553400 is about 1124.4005761442.

The spelling of 1421553400 in words is "one billion, four hundred twenty-one million, five hundred fifty-three thousand, four hundred".