431661400 has 24 divisors (see below), whose sum is σ = 1003613220. Its totient is φ = 172664480.

The previous prime is 431661389. The next prime is 431661409. The reversal of 431661400 is 4166134.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431661409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1078954 + ... + 1079353.

Almost surely, 2^431661400 is an apocalyptic number.

431661400 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

431661400 is an abundant number, since it is smaller than the sum of its proper divisors (571951820).

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

431661400 is a wasteful number, since it uses less digits than its factorization.

431661400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2158323 (or 2158314 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 431661400 is about 20776.4626440595. The cubic root of 431661400 is about 755.7550740229.

The spelling of 431661400 in words is "four hundred thirty-one million, six hundred sixty-one thousand, four hundred".