401778252 has 24 divisors (see below), whose sum is σ = 1041647600. Its totient is φ = 133926048.

The previous prime is 401778239. The next prime is 401778257. The reversal of 401778252 is 252877104.

It is a super-2 number, since 2×401778252² = 322851527560351008, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (401778257) 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, 1859977 + ... + 1860192.

Almost surely, 2^401778252 is an apocalyptic number.

It is an amenable number.

401778252 is an abundant number, since it is smaller than the sum of its proper divisors (639869348).

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

401778252 is a wasteful number, since it uses less digits than its factorization.

401778252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3720182 (or 3720174 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The square root of 401778252 is about 20044.4070004578. The cubic root of 401778252 is about 737.8965417798.

The spelling of 401778252 in words is "four hundred one million, seven hundred seventy-eight thousand, two hundred fifty-two".