37072821 has 4 divisors (see below), whose sum is σ = 49430432. Its totient is φ = 24715212.

The previous prime is 37072813. The next prime is 37072823. The reversal of 37072821 is 12827073.

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 37072821 - 2³ = 37072813 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 (37072823) 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, 6178801 + ... + 6178806.

It is an arithmetic number, because the mean of its divisors is an integer number (12357608).

Almost surely, 2^37072821 is an apocalyptic number.

It is an amenable number.

37072821 is a deficient number, since it is larger than the sum of its proper divisors (12357611).

37072821 is a wasteful number, since it uses less digits than its factorization.

37072821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12357610.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 37072821 is about 6088.7454372802. The cubic root of 37072821 is about 333.4406506675.

Adding to 37072821 its reverse (12827073), we get a palindrome (49899894).

The spelling of 37072821 in words is "thirty-seven million, seventy-two thousand, eight hundred twenty-one".