31400430 has 16 divisors (see below), whose sum is σ = 75361104. Its totient is φ = 8373440.

The previous prime is 31400429. The next prime is 31400437. The reversal of 31400430 is 3400413.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31400437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 523311 + ... + 523370.

It is an arithmetic number, because the mean of its divisors is an integer number (4710069).

Almost surely, 2^31400430 is an apocalyptic number.

31400430 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31400430 is an abundant number, since it is smaller than the sum of its proper divisors (43960674).

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

31400430 is a wasteful number, since it uses less digits than its factorization.

31400430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046691.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 31400430 is about 5603.6086587127. The cubic root of 31400430 is about 315.4848667859.

Adding to 31400430 its reverse (3400413), we get a palindrome (34800843).

The spelling of 31400430 in words is "thirty-one million, four hundred thousand, four hundred thirty".