401249918 has 4 divisors (see below), whose sum is σ = 601874880. Its totient is φ = 200624958.

The previous prime is 401249911. The next prime is 401249969. The reversal of 401249918 is 819942104.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×401249918² = 322002993390013448, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401249911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100312478 + ... + 100312481.

It is an arithmetic number, because the mean of its divisors is an integer number (150468720).

Almost surely, 2^401249918 is an apocalyptic number.

401249918 is a deficient number, since it is larger than the sum of its proper divisors (200624962).

401249918 is a wasteful number, since it uses less digits than its factorization.

401249918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200624961.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 401249918 is about 20031.2235772057. The cubic root of 401249918 is about 737.5729579456.

The spelling of 401249918 in words is "four hundred one million, two hundred forty-nine thousand, nine hundred eighteen".