1220935690 has 32 divisors (see below), whose sum is σ = 2383799040. Its totient is φ = 447557184.

The previous prime is 1220935663. The next prime is 1220935691. The reversal of 1220935690 is 965390221.

1220935690 = T₂₇₆ + T₂₇₇ + ... + T₁₉₄₃.

It is a super-2 number, since 2×1220935690² = 2981367918231552200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1220935691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15714 + ... + 51853.

It is an arithmetic number, because the mean of its divisors is an integer number (74493720).

Almost surely, 2^1220935690 is an apocalyptic number.

1220935690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1220935690 is a deficient number, since it is larger than the sum of its proper divisors (1162863350).

1220935690 is a wasteful number, since it uses less digits than its factorization.

1220935690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67726.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 1220935690 is about 34941.8901892843. The cubic root of 1220935690 is about 1068.8028331781.

The spelling of 1220935690 in words is "one billion, two hundred twenty million, nine hundred thirty-five thousand, six hundred ninety".