402045420 has 96 divisors (see below), whose sum is σ = 1290110976. Its totient is φ = 91641600.

The previous prime is 402045409. The next prime is 402045481. The reversal of 402045420 is 24540204.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 179910 + ... + 182130.

It is an arithmetic number, because the mean of its divisors is an integer number (13438656).

Almost surely, 2^402045420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 402045420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (645055488).

402045420 is an abundant number, since it is smaller than the sum of its proper divisors (888065556).

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

402045420 is a wasteful number, since it uses less digits than its factorization.

402045420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2671 (or 2669 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 402045420 is about 20051.0702956226. The cubic root of 402045420 is about 738.0600637067.

Adding to 402045420 its reverse (24540204), we get a palindrome (426585624).

The spelling of 402045420 in words is "four hundred two million, forty-five thousand, four hundred twenty".