15420390 has 16 divisors (see below), whose sum is σ = 37009008. Its totient is φ = 4112096.

The previous prime is 15420367. The next prime is 15420401. The reversal of 15420390 is 9302451.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 15420390.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256977 + ... + 257036.

It is an arithmetic number, because the mean of its divisors is an integer number (2313063).

Almost surely, 2^15420390 is an apocalyptic number.

15420390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15420390 is an abundant number, since it is smaller than the sum of its proper divisors (21588618).

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

15420390 is a wasteful number, since it uses less digits than its factorization.

15420390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514023.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 15420390 is about 3926.8804412663. The cubic root of 15420390 is about 248.9039483725.

The spelling of 15420390 in words is "fifteen million, four hundred twenty thousand, three hundred ninety".