401778396 has 36 divisors (see below), whose sum is σ = 1027026000. Its totient is φ = 132420288.

The previous prime is 401778379. The next prime is 401778397. The reversal of 401778396 is 693877104.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×401778396² = 322851758984665632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401778397) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59496 + ... + 65903.

It is an arithmetic number, because the mean of its divisors is an integer number (28528500).

Almost surely, 2^401778396 is an apocalyptic number.

It is an amenable number.

401778396 is an abundant number, since it is smaller than the sum of its proper divisors (625247604).

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

401778396 is a wasteful number, since it uses less digits than its factorization.

401778396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125498 (or 125493 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 401778396 is about 20044.4105924819. The cubic root of 401778396 is about 737.8966299355.

The spelling of 401778396 in words is "four hundred one million, seven hundred seventy-eight thousand, three hundred ninety-six".