70399921 has 8 divisors (see below), whose sum is σ = 75362400. Its totient is φ = 65563200.

The previous prime is 70399913. The next prime is 70399933. The reversal of 70399921 is 12999307.

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

It is a cyclic number.

It is not a de Polignac number, because 70399921 - 2³ = 70399913 is a prime.

It is a super-2 number, since 2×70399921² = 9912297753612482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70399991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30280 + ... + 32521.

It is an arithmetic number, because the mean of its divisors is an integer number (9420300).

Almost surely, 2^70399921 is an apocalyptic number.

It is an amenable number.

70399921 is a deficient number, since it is larger than the sum of its proper divisors (4962479).

70399921 is a wasteful number, since it uses less digits than its factorization.

70399921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62879.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 70399921 is about 8390.4660776384. The cubic root of 70399921 is about 412.9118917315.

The spelling of 70399921 in words is "seventy million, three hundred ninety-nine thousand, nine hundred twenty-one".