400437381 has 4 divisors (see below), whose sum is σ = 533916512. Its totient is φ = 266958252.

The previous prime is 400437379. The next prime is 400437403. The reversal of 400437381 is 183734004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 400437381 - 2¹ = 400437379 is a prime.

It is a super-2 number, since 2×400437381² = 320700192204278322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400437311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66739561 + ... + 66739566.

It is an arithmetic number, because the mean of its divisors is an integer number (133479128).

Almost surely, 2^400437381 is an apocalyptic number.

It is an amenable number.

400437381 is a deficient number, since it is larger than the sum of its proper divisors (133479131).

400437381 is a wasteful number, since it uses less digits than its factorization.

400437381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133479130.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 400437381 is about 20010.9315375372. The cubic root of 400437381 is about 737.0747561339.

The spelling of 400437381 in words is "four hundred million, four hundred thirty-seven thousand, three hundred eighty-one".