37400021 has 8 divisors (see below), whose sum is σ = 37911744. Its totient is φ = 36891360.

The previous prime is 37399993. The next prime is 37400023. The reversal of 37400021 is 12000473.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-37400021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37400023) 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, 33545 + ... + 34641.

It is an arithmetic number, because the mean of its divisors is an integer number (4738968).

Almost surely, 2^37400021 is an apocalyptic number.

It is an amenable number.

37400021 is a deficient number, since it is larger than the sum of its proper divisors (511723).

37400021 is a wasteful number, since it uses less digits than its factorization.

37400021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1531.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 37400021 is about 6115.5556575016. Note that the first 3 decimals coincide. The cubic root of 37400021 is about 334.4187470174.

Adding to 37400021 its reverse (12000473), we get a palindrome (49400494).

The spelling of 37400021 in words is "thirty-seven million, four hundred thousand, twenty-one".